Lesson 32 MQ-2 Gas Sensor
Introduction
MQ-2 is a sensor that can detect flammable gases such as methane, hydrogen, and propane
and so on. It adopts the low conductivity stannic oxide for the basic material. When there
are flammable gases in the ambient environment, the conductivity of the sensor will
increase as the gases become denser. This type can detect a wide range of gases thus
making it a low cost multifunctional sensor. The sensor can be used for methane leak
alarm and automatic smoke exhaust fan. With the features, it boasts a perfect sensor for
indoor air regulation that meets the environmental standards.
Notes:
1. This sensor is equipped with an adjustment potentiometer for the alarm threshold.
Spin the knob of the pot clockwise, and the threshold will be increased; spin it
counterclockwise, the threshold will be reduced.
2. The sensor may not output a steady and accurate data immediately; it needs to be
preheated for about 1 minute to collect data steadily.
Components
- 1 * Raspberry Pi
- 1 * GPIO Extension Board
- 1 * 40-Pin GPIO Cable
- 1 * Breadboard
- 1 * ADC0832 Module
- 1 * MQ-2 Gas Sensor Module
- 1 * 3-Pin Wires
- 1 * 4-Pin Wires
- 1 * 5-Pin Wires
Experimental Principle
The Fritzing image:
The Physical picture:
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